JPS6169006A - Composite optical fiber - Google Patents
Composite optical fiberInfo
- Publication number
- JPS6169006A JPS6169006A JP60201539A JP20153985A JPS6169006A JP S6169006 A JPS6169006 A JP S6169006A JP 60201539 A JP60201539 A JP 60201539A JP 20153985 A JP20153985 A JP 20153985A JP S6169006 A JPS6169006 A JP S6169006A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- multimode
- core
- single mode
- composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は複合光ファイバ、更に詳しく言えば、高速、低
速双方向伝送を行なうための単一モード多モード数台光
ファイバに係る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to composite optical fibers, and more particularly to single-mode multimode optical fibers for high-speed and low-speed bidirectional transmission.
公衆通信回線の加入者に画像等を含む各種のサービスを
行う場合、コスト等の面から、光ファイバを導入するこ
とが有望視されている。この場合中央局（センタ）から
加入者端末（サブスクライバ）への伝送情報としては、
音声、ディジタル化多重信号、動画、静止画などのＶ）
ＩＦ多重信号が考えられるが、これらを総合した信号帯
域は広く、信号がすべてディジタル化される場合Ｆこは
、数１００ＭＨｚ〜ＩＧＨｚ程度の帯域が要求される。When providing various services including images to subscribers of public communication lines, it is considered promising to introduce optical fibers from the viewpoint of cost and the like. In this case, the information transmitted from the central office (center) to the subscriber terminal (subscriber) is as follows:
V) such as audio, digital multiplexed signals, moving images, still images, etc.
IF multiplexed signals can be considered, but the signal band of these combined signals is wide, and if all the signals are digitized, a band of about several hundred MHz to IGHz is required.
一方すブスクライパからセンタへの伝送情報としては、
音声、データやファックスなどのディジタル信号などで
あるが、これらの信号帯域はディジタル化を行なっても
１００ＭＨｚ以下である。サス
ブダクライバのコストは低いことが望ましいが、この観
点からみると、サブスクライバからセンタへの上りの伝
送は高速変調特性が要求されないことから、光源として
安価な発光ダイオード（ＬＥＤ）を用い、伝送路として
は、ＬＥＤとの結合効率が良い多モードファイバを用い
、センタからサブスクライバへの下りの伝送は光源とし
て高速変調が可能な半導体レーザを、また伝送路として
広帯域特性を有する単一モードファイバを用いることが
考えられる。このため、−加入者あたり、単一モードお
よび多モードの２本の光ファイバを布設することが考え
られるが、加入者細配線の単純化の観点から、１本の光
ファイバで上記双方向の伝送を行なうことが望ましい。On the other hand, the information transmitted from the book scraper to the center is as follows:
These include digital signals such as voice, data, and facsimile, but the signal band of these signals is 100 MHz or less even if they are digitized. It is desirable for the cost of the sub-client to be low, but from this point of view, the upstream transmission from the subscriber to the center does not require high-speed modulation characteristics, so an inexpensive light emitting diode (LED) is used as the light source, and the transmission path is , a multi-mode fiber with good coupling efficiency with LEDs is used, a semiconductor laser capable of high-speed modulation is used as the light source for downlink transmission from the center to the subscribers, and a single-mode fiber with broadband characteristics is used as the transmission path. Conceivable. For this reason, it is conceivable to install two optical fibers, one single mode and one multimode, per subscriber, but from the viewpoint of simplifying subscriber wiring, one optical fiber can be used for both directions. It is desirable to perform transmission.
従来、このような用途ｆこ用いる光ファイバとして、第
１図１こ示されるような構造のものが考えられていた。Conventionally, an optical fiber having a structure as shown in FIG. 1 has been considered as an optical fiber used for such purposes.
ここで、１は単一モードコア部、２は多モードコア部で
あり、３は両者に共通のクラッド部である。本構造によ
り、単一および多モードの双方向伝速が可能であるが、
このような円形断面でコア部が非対称の光ファイバは、
低損失な光ファイバの作製法であるＭＣＶＤ法やＶＡＤ
法ｌこよる作製がきわめて難しいうえ、外形が軸対称な
円形断面であるため、スプライスやコネクションなどの
接続に困難を生ずる。Here, 1 is a single mode core section, 2 is a multimode core section, and 3 is a cladding section common to both. This structure allows single and multimode bidirectional transmission;
An optical fiber like this with a circular cross section and an asymmetric core is
MCVD method and VAD method, which are low-loss optical fiber manufacturing methods.
In addition to being extremely difficult to manufacture due to the process, the external shape is an axially symmetrical circular cross section, making it difficult to make connections such as splices and connections.
本発明の目的は上記困難を解決する双方向伝送用光ファ
イバを提供することにある。An object of the present invention is to provide an optical fiber for bidirectional transmission that solves the above-mentioned difficulties.
本発明は、単一モードコアと多モードコアを有１
する複合コア光ファイバｆこおいて外形を非軸対
称・１ おｔ６ｃａｆｃよ０、いや、あ１゜５、ヵ
、９１゜も比較的容易にするものである。The present invention has a single mode core and a multimode core.
It is relatively easy to make the external shape of the composite core optical fiber f non-axially symmetrical, 1°, 5°, 91°.
以下、図面を用いて本発明の詳細な説明する。 Hereinafter, the present invention will be explained in detail using the drawings.
第２図は本発明による光ファイバの一実施例の構成を示
す断面図である。本構造は単一モードファイパト多モー
ドファイバのクラッドが一部融着されたものであり、単
一モードコア部１を包むクラヴド部３と多モードコア部
２を含むクラッド部３′との外径寸法は異なっている。FIG. 2 is a sectional view showing the structure of an embodiment of the optical fiber according to the present invention. This structure is one in which the cladding of a single mode fiber and a multimode fiber are partially fused, and the cladding part 3 surrounding the single mode core part 1 and the cladding part 3' including the multimode core part 2 are separated from each other. The diameter dimensions are different.
このような形状の光ファイバは、あらかじめ、ＭＣＶＤ
法やＶＡＤ法により単一モードと多モード光ファイバの
プリフォームを作製しておき、これらをプリフォーム段
階で融着した後、光ファイバに線引きすることにより容
易に得ることが出来る。Optical fibers with such a shape are pre-treated with MCVD.
Single-mode and multi-mode optical fiber preforms are prepared by the method or VAD method, and after these are fused at the preform stage, they can be easily obtained by drawing into optical fibers.
第３図はＭＣＶＤ法Ｉこより作製した本発明による光フ
ァイバの断面を、また第４図はＡ−Ａ’断あり、４．４
’は８２０３などの屈折率低下用ド １ｊ−ハ
ントを含む低損失クラッド部、１および２はそれぞれＰ
２Ｏ，、Ｇｅ２０．などの屈折率上昇用ドーパントを含
む、単一モードコア部および多モードコア部である。Fig. 3 shows a cross section of an optical fiber according to the present invention manufactured by MCVD method I, and Fig. 4 shows a cross section along line A-A'.
' is a low-loss cladding section including a refractive index lowering dome such as 8203, 1j-hunt, 1 and 2 are P
2O,,Ge20. A single mode core portion and a multimode core portion containing a refractive index increasing dopant such as.
以上、本発明によれば、低損失な単一モード、多モード
複合コア光ファイ；（を得ることができる。As described above, according to the present invention, it is possible to obtain a low-loss single mode and multimode composite core optical fiber.
さらに、本発明による光ファイバは外形が非軸対称であ
り、単一モードコア部、多モードコア部を包むクラッド
部の外径が異なるため、この点を利用して、コア部の高
精度突き合せが可能なコネクタを比較的容易に実現でき
る。またスプライスについても、たとえば従来の放電融
着スプライス技術の適用１こより低損失な接続を得るこ
とが可能である。Furthermore, the optical fiber according to the present invention has a non-axisymmetric outer shape, and the outer diameters of the cladding parts surrounding the single-mode core part and the multi-mode core part are different. Connectors that can be matched can be realized relatively easily. As for splices, it is also possible to obtain connections with lower loss than, for example, by applying conventional discharge fusion splicing techniques.
なお、実施例では多モードコツ部属折率分布をステップ
状として説明したが、グレーテッド屈折率分布のものに
も適用で専ることはいうまでもない０In addition, in the examples, the multi-mode partial refractive index distribution was explained as being step-like, but it goes without saying that this method can also be applied to a graded refractive index distribution.
第１図は従来提案されていた単一モード、多モード複合
コア光ファイバの断面図、第２図は本発明による複合コ
ア光ファイバの一実施例の断面図、第３図はＭＣＶＤ法
により作製された本発明による光ファイバの断面図、第
４図は第３図Ａ−Ａ’断面での屈折率分布を示す図であ
る。
１・・・単一モードコア部、２・・・多モードコア部、
３゜３′・・・共通りラッド部、ト・・単一モードクラ
ッド部、４′・・・多モードクラッド部、５．５’
・・・サポート管。
篤 １ 目
第２図
畜３図
第４図
□庫榊Fig. 1 is a cross-sectional view of a conventionally proposed single-mode and multi-mode composite core optical fiber, Fig. 2 is a cross-sectional view of an embodiment of a composite-core optical fiber according to the present invention, and Fig. 3 is a cross-sectional view of a composite core optical fiber manufactured by the MCVD method. FIG. 4 is a cross-sectional view of the optical fiber according to the present invention, which shows the refractive index distribution at the cross section taken along line AA' in FIG. 1... Single mode core part, 2... Multimode core part,
3゜3'... Common rad part, G... Single mode cladding part, 4'... Multimode cladding part, 5.5'
...Support tube. Atsushi 1 Eye 2 Animal 3 Figure 4 Kurosaki
Claims (1)
多モード光ファイバ伝送路がそのクラッド部で融着され
てなることを特徴とする複合光ファイバ。A composite optical fiber characterized in that a single mode optical fiber transmission line and a multimode optical fiber transmission line having different outer diameters are fused together at their cladding parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201539A JPS6169006A (en) | 1985-09-13 | 1985-09-13 | Composite optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201539A JPS6169006A (en) | 1985-09-13 | 1985-09-13 | Composite optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6169006A true JPS6169006A (en) | 1986-04-09 |
Family
ID=16442723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60201539A Pending JPS6169006A (en) | 1985-09-13 | 1985-09-13 | Composite optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6169006A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2355541A (en) * | 1999-10-23 | 2001-04-25 | Marconi Electronic Syst Ltd | Optic fibre with monomode core and multimode core or layer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55105008A (en) * | 1979-02-07 | 1980-08-12 | Sadao Fujimoto | Method and sign for guiding automobile |
-
1985
- 1985-09-13 JP JP60201539A patent/JPS6169006A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55105008A (en) * | 1979-02-07 | 1980-08-12 | Sadao Fujimoto | Method and sign for guiding automobile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2355541A (en) * | 1999-10-23 | 2001-04-25 | Marconi Electronic Syst Ltd | Optic fibre with monomode core and multimode core or layer |
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